Magnetic contact switch (door sensor)
-
Description
Description-
This sensor is essentially a reed switch, encased in an ABS plastic shell. Normally the reed is 'open' (no connection between the two wires). The other half is a magnet. When the magnet is less than 13mm (0.5") away, the reed switch closes. They're often used to detect when a door or drawer is open, which is why they have mounting tabs and screws. You can also pick up some double-sided foam tape from a hardware store to mount these, that works well without needing screws.
-
Technical Details
Technical Details+
- Normally open reed switch
- ABS enclosure
- Rated current: 100 mA max
- Rated voltage: 200 VDC max
- Distance: 15mm max
Dimensions:
- Box size (each side): 29mm x 14mm x 9mm / 1.1" x 0.6" x 0.4"
- Cable Length: 305mm ± 12mm / 12" ± 0.5"
- Weight (per side): 5.4g
Netduino driver and Netduino sample. This sample shows how to use an interrupt handler to respond to a button press or a magnetic contact switch closing.
-
Learn
Learn+
A sitcom soundtrack for your life
Sense movement and doors opening with your Raspberry Pi
Use the Trinket to build a custom wireless alarm system
Know when it's open for business.
How to outfit a simple live trap with sensors and data-logging, and quantify the vermin in your life.Know who is comin' and goin'
Protect your home with MQTT and the ESP8266!Build your own locking mystery box which can only be opened with a magnet in just the right place!When your microcontroller needs to accurately read if a switch is flippedProtect against intruders by building a security system for a cardboard smart home using Adafruit IO.
MAY WE ALSO SUGGEST...
MAY WE ALSO SUGGEST...-
-
Distributors+
See our Distributors page for a complete list of distributors.
Ordering full reels vs. cut reels
Adafruit NeoPixel Digital RGB LED strips come to us in 4 or 5 meter reels with a 2 or 3-pin JST SM connector on each end and separated power/ground wires as shown in the pic below. If you order a full 4 or 5 meters, you get the full reel with both connectors installed (like the pic below).
If you buy less than a full reel, you'll get a single strip, but it will be a cut piece from a reel which may or may not have a connector on it. If the piece comes from the end of the reel, the connector may be on the output end of the strip!
